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In General Packet Radio Service (GPRS), a Mobile Station (MS) is tracked at the cell level during packet transmission, and is tracked at the Routing Area (RA) level when no packet is delivered. A READY Timer (RT) mechanism was proposed in 3GPP 23.060 to determine when to switch from cell tracking to RA tracking. In this mechanism, a threshold interval is defined. If no packet is delivered within, the MS is tracked at the RA level. When a packet arrives, the MS is tracked at the cell level again. However, the RT mechanism has a major fallacy that the READY timers in both the MS and the SGSN may lose synchronization. This paper considers another mechanism called READY Counter (RC) to resolve this problem.
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